Analisis Risiko Kegagalan Pada Struktur Jacket Platform Akibat Variasi Kedalaman Scouring

Afifah, Maulidiya (2025) Analisis Risiko Kegagalan Pada Struktur Jacket Platform Akibat Variasi Kedalaman Scouring. Other thesis, Institut Teknologi Sepuluh Nopember Surabaya.

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Abstract

Penelitian ini bertujuan untuk menganalisis keandalan struktur platform jacket 3 kaki terhadap pengaruh kedalaman scouring menggunakan perangkat lunak SACS. Proses pemodelan dilakukan untuk memvisualisasikan struktur utama seperti main deck, cellar deck, dan struktur jacket. Validasi model menunjukkan nilai error hanya sebesar 0,49%, menandakan model telah merepresentasikan kondisi aktual dengan baik. Analisis in-place menunjukkan seluruh anggota struktur memiliki nilai Unity Check (UC) di bawah 1, baik pada kondisi operasi maupun badai, sehingga dapat disimpulkan struktur dalam keadaan aman. Analisis dilanjutkan dengan evaluasi terhadap efek scouring pada beberapa kedalaman (1–9 meter). Hasilnya menunjukkan bahwa semakin dalam scouring, nilai UC dan joint punching shear meningkat, namun tetap dalam batas aman (UC < 1). Analisis faktor keamanan (safety factor) menunjukkan bahwa pile mengalami penurunan performa seiring bertambahnya kedalaman scouring, namun sebagian besar masih berada di atas ambang batas keamanan. Analisis keandalan menggunakan metode MVFOSM menunjukkan bahwa struktur memiliki nilai indeks keandalan (β) yang tinggi, dengan probability of failure (PoF) sangat kecil pada hampir seluruh kondisi. Namun, pada kondisi scouring terdalam (9 meter) dalam kondisi badai, nilai β untuk beberapa pile mendekati atau sedikit di bawah batas minimum (β = 3,09), yang menunjukkan peningkatan risiko kegagalan. Secara keseluruhan, struktur platform masih dalam batas aman dan andal terhadap pengaruh scouring
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This study aims to analyze the reliability of a 3-legged jacket platform structure under the influence of scouring depth using SACS software. The modeling process was conducted to visualize the main structural components such as the main deck, cellar deck, and the jacket structure. Model validation showed an error value of only 0.49%, indicating that the model accurately represents actual conditions. In-place analysis revealed that all structural members had Unity Check (UC) values below 1, both under operating and storm conditions, indicating the structure is safe. Further analysis evaluated the effect of scouring at various depths (1–9 meters). The results showed that as the scouring depth increases, UC values and joint punching shear also increase but remain within safe limits (UC < 1). The safety factor analysis showed a decline in pile performance with increasing scouring depth, although most still remained above the safety threshold. Reliability analysis using the MVFOSM method and indicated high reliability index (β) values, with a very low probability of failure (PoF) under most conditions. However, under the deepest scouring condition (9 meters) combined with storm loading, the β value for several piles approached or slightly fell below the minimum threshold (β = 3.09), indicating an increased risk of failure. Overall, the platform structure remains within safe and reliable limits against the effects of scouring.

Item Type:	Thesis (Other)
Subjects:	T Technology > TS Manufactures > TS174 Maintainability (Engineering) . Reliability (Engineering)
Depositing User:	Maulidiya Afifah
Date Deposited:	31 Jul 2025 03:47
Last Modified:	31 Jul 2025 03:47
URI:	http://repository.its.ac.id/id/eprint/124859

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